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The system decides on the number of replication groups automatically. In the current release, the decision is fairly simple: it depends on the number of Storage Nodes and the Replication Factor. For a given Replication Factor, having more Storage Nodes will tend to result in more groups.1 person found this helpful
For example, if you had nine Storage Nodes, and a Replication Factor of 3, the system would create 3 replication groups.
How NoSQL select replication node in to group.
I'm sorry, I don't understand your question. Please elaborate.